The control unit has all possible engine data and characteristics at its disposal. This is provided by the Hall sensor or the engine speed and crankshaft position sensor, as well as the engine temperature sensor, throttle position sensor, etc.
If we express the ignition angle (ignition timing) by means of the engine load condition and the engine speed, we obtain the so-called ignition characteristic. The Motronic ignition characteristic is readily demonstrated due to its unusual form – it allows us to draw a conclusion about the exact influence of these parameters on the operating condition of the engine.
Of course, there is an exchange of data with the injection. Including because some sensors on the engine have a dual purpose.
The control unit has programs for adjusting engine start, cold engine operation, operating mode, etc.
The control unit supplies the ignition coils with exactly the current that they need at the moment. In extreme cases, (ignition on, engine not running) with such ignition, it cannot lead to damage to the coil even after a long time.
Knock control allows the engine to be operated with the maximum possible ignition advance, resulting in better power output.
Therefore, engines with a power of up to 110 kW, designed for operation on superfuel, with some loss of power, can also run on standard gasoline, since the control unit recognizes the lower octane number and switches to a different ignition characteristic.
On the other hand, with a 128 kW engine, better traction is achieved by using super plus petrol with an octane rating of 98. In this case, standard petrol is only intended as a forced solution with an extremely gentle driving style.
And finally, a computer is installed to store information about faults in the ignition system, which is read in the workshop using a reading device (chapter Regular maintenance).
Information obtained from this resource: AudiManual